If you know, you know. Stan's Tri-Y design improves low end torque and had the reputation of being among the very best headers available. Stan retired in 2022 so these are a rare bird.
They are new in the box and never installed. I paid extra for the complete ceramic coating in a nice metallic gray color.
Please don’t ask if they will fit ********* . They are custom made for a SBC C3 Corvette and that’s all I know.